Notes_STL_List_And_Map

// Description: STL encountered in the use of

//Create Date: 2019-07-08 09:19:15

//Author: channy

Notes_STL_List_And_Map

Given: After erase the iterator will expire, should reset the iterator

Problem: the program will still crash

Cause: This code is unknown reasons. Work appeared erase code is a local variable, in fact, did not erase map

Follow-up: a good try after a few days. . .

(Did not experience the bug interpreted as theology is not a good programmer programmers)

Code:

#include <QCoreApplication>
#include <QDebug>
int main(int argc, char *argv[])
{
    //QCoreApplication a(argc, argv);

    QList<int> ql;
    qDebug() << ql.size();

    QMap<int, QList<int>> qm;
    qm[0] = ql;

    for (QMap<int, QList<int>>::iterator iter = qm.begin(); iter != 大专栏  Notes_STL_List_And_Map"n">qm.end(); iter++) {

        qDebug() << qm.size();

        for (QList<int>::iterator itr = iter->begin(); itr != iter->end(); itr++) {
            itr = iter->erase(itr);
        }

        if (iter->size() == 0) {
            iter = qm.erase(iter);
            //如果不加下面的判断，会崩溃。。。iter != qm.end() == true. But why???
			if (qm.size() == 0) break;
        }
    }

    //return a.exec();
    return 0;
}

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